Scroll Compressor Auxiliary Discharge Path Design
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Solution Overview
Problem
The existing scroll compressors face challenges in ensuring a sufficient discharge area at the initial discharge stage, leading to increased discharge resistance, and maintaining a high compression ratio, as the discharge hole is often covered by the orbiting wrap, and enlarging the discharge hole size compromises the compression ratio.
Innovation Solution
An auxiliary discharge path is introduced, connecting the side of the orbiting wrap to its bottom surface, forming a recessed groove shape that allows for a larger discharge area without altering the compression ratio, and reducing friction by cooling the fixed end plate portion with refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge hole is enlarged to increase discharge area, then discharge resistance is reduced, but compression ratio deteriorates
Solution Approach 1:
The discharge path is divided into two separate paths: a main discharge path through the discharge hole in the fixed end plate, and an auxiliary discharge path formed by the recessed groove on the orbiting wrap. This segmentation allows each path to contribute to discharge without requiring the discharge hole to be excessively large, thereby maintaining compression ratio while ensuring sufficient discharge area.
Solution Approach 2:
The auxiliary discharge path utilizes the vertical dimension by forming a recessed groove on the orbiting wrap that extends from the side surface toward the bottom surface. This three-dimensional approach increases the effective discharge area without expanding the discharge hole in the fixed end plate, thus avoiding compression ratio deterioration.
2Area of stationary object
If the discharge hole is covered by the orbiting wrap, then discharge area is insufficient, but increasing discharge hole size compromises compression ratio
Solution Approach 1:
The recessed groove is pre-formed on the orbiting wrap at a position that ensures it will be exposed to the compression chamber at the appropriate crank angle. This preliminary preparation of the auxiliary discharge path ensures that sufficient discharge area is available when needed, without requiring the discharge hole to be enlarged in advance.
3Productivity
If refrigerant flows through the auxiliary discharge path, then discharge area is increased and discharge resistance is reduced, but friction between orbiting and fixed scrolls increases
Solution Approach 1:
The friction between the orbiting wrap and fixed end plate, which was previously a harmful factor causing seizure, is converted into a beneficial cooling mechanism. The refrigerant flowing through the auxiliary discharge path exploits this contact area to cool the fixed end plate, transforming the friction problem into a heat dissipation solution that prevents seizure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces discharge resistance and maintains the compression ratio by enlarging the discharge area and preventing seizure between the orbiting and fixed scrolls, while also cooling the fixed end plate portion.
Implementation Method 1
cooling the fixed end plate portion with refrigerant flow
Data Source
AI summary
A scroll compressor is disclosed, which comprises an auxiliary discharge path capable of sufficiently making sure of a discharge area at an initial discharge stage. The compressor comprises a fixed scroll including a fixed end plate portion and a fixed wrap, and an orbiting scroll including an orbiting end plate portion and an orbiting wrap, wherein a discharge hole is formed in the fixed end plate portion, and an auxiliary discharge path for connecting a side of the orbiting wrap with a bottom surface of the orbiting wrap is provided to be communicated with the discharge hole, whereby a compressed refrigerant may be discharged through the auxiliary discharge path.